Include only stuff you need, part 4: ast, scopes + fallout.

src/crankshaft/hydrogen.cc

 // Copyright 2013 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "src/crankshaft/hydrogen.h"
 
 #include <memory>
 #include <sstream>
 
 #include "src/allocation-site-scopes.h"
 #include "src/ast/ast-numbering.h"
+#include "src/ast/scopes.h"
 #include "src/code-factory.h"
 #include "src/crankshaft/hydrogen-bce.h"
 #include "src/crankshaft/hydrogen-canonicalize.h"
 #include "src/crankshaft/hydrogen-check-elimination.h"
 #include "src/crankshaft/hydrogen-dce.h"
 #include "src/crankshaft/hydrogen-dehoist.h"
 #include "src/crankshaft/hydrogen-environment-liveness.h"
 #include "src/crankshaft/hydrogen-escape-analysis.h"
 #include "src/crankshaft/hydrogen-gvn.h"
 #include "src/crankshaft/hydrogen-infer-representation.h"
@@ skipping 13410 matching lines @@
     isolate()->GetHTracer()->TraceHydrogen(name(), graph_);
   }
 
 #ifdef DEBUG
   graph_->Verify(false);  // No full verify.
 #endif
 }
 
 }  // namespace internal
 }  // namespace v8